Https://irvingtonnj.gov/wp-content/uploads/fsqm-files/OS4JK9qm5L7Q5GFTwhat-happens-if-you-dont-check-in-24-hours-before-your-flight-with-united-%E2%9F%A6-fa-q-%E2%9F%AD-1.pdf https://irvingtonnj.gov/wp-content/uploads/fsqm-files/OS4JK9qm5L7Q5GFTwhat-happens-if-you-dont-check-in-24-hours-before-your-flight-with-united-%E2%9F%A6-fa-q-%E2%9F%AD-1.pdf